Image display apparatus

Patent metadata

Field	Value
Publication number	US-9761163-B2
Application number	US-201514750519-A
Country	US
Kind code	B2
Filing date	Jun 25, 2015
Priority date	Jan 4, 2013
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

An image display apparatus includes a laser light source unit configured to output a luminous flux, a scanning mirror unit configured to reflect the luminous flux by reciprocating driving in a main-scanning direction and a sub-scanning direction, a light source driving unit configured to drive the light source unit based on image data, a bit shift processing unit configured to adjust a brightness value of a pixel included in the image date, and a dimming processing unit configured to perform control in such a manner that a brightness value of a pixel included in the image data is not displayed as zero with respect to the image data subjected to dimming processing by the bit shift processing unit according to a predetermined rule.

First claim

What is claimed is:

1. An image display apparatus comprising:
a laser light source unit configured to output a luminous flux;
a scanning mirror unit configured to reflect the luminous flux by reciprocating driving in a main-scanning direction and a sub-scanning direction;
a light source driving unit configured to drive the laser light source unit based on image data;
a bit shift processing unit configured to adjust a brightness value of a pixel included in the image data; and
a dimming processing unit configured to perform control in such a manner that a brightness value of a pixel included in the image data is displayed as zero with respect to the image data subjected to dimming processing by the bit shift processing unit according to a predetermined rule;
an external light sensor;
a light adjustment level setting unit configured to determine a light adjustment level based on a sensor value from the external light sensor; and
a table that is stored in the light adjustment level setting unit and used to determine the light adjustment level, wherein
the image display apparatus is configured to perform an adjustment of relative brightness corresponding to brightness of external light by at least combining one or more of a gain adjustment in which increasing or decreasing a gain of a driving current applied to the laser light source unit is performed by the light source driving unit, a bit shift operation in which adjusting the brightness value of the pixel is performed by the bit shift processing unit, and dimming processing performed by the dimming processing unit in which the brightness value of the pixel is brought to zero according to the predetermined rule.

2. The image display apparatus according to claim 1 , wherein the dimming processing unit performs control in such a manner that a brightness value of a scanning line in either a going path or a returning path of the scanning mirror unit is displayed as zero.

3. The image display apparatus according to claim 1 , wherein the dimming processing unit performs control in such a manner that a brightness value of every other pixel is displayed as zero on a scanning line in the main-scanning direction.

4. The image display apparatus according to claim 3 , wherein the dimming processing unit performs control in such a manner that pixels, whose brightness values are zero, are displayed not to line up in a vertical direction in a scanning line of a going path in the main-scanning direction and a scanning line of a returning path in the main-scanning direction.

5. The image display apparatus according to claim 1 , wherein
when the sensor value is smaller than a predetermined value, the bit shift processing unit decreases the brightness value of the pixel and the dimming processing unit brings the brightness value of the pixel reduced by the bit shift processing unit to zero, and
when the sensor value is larger than the predetermined value, the bit shift processing unit increases the brightness value of the pixel and the dimming processing unit does not perform the dimming processing in which the brightness value of the pixel adjusted by the bit shift processing unit is brought to zero.

Assignees

• Jvc Kenwood Corp

Inventors

• Ohyama Minoru
• Iwata Kazumi
• Okazaki Ryuichi
• Nakano Tatsuya

Classifications

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G3/025 Primary

  with scanning or deflecting the beams in two directions or dimensions · CPC title

• G09G2360/144

  the light being ambient light · CPC title

• H04N9/3182

  Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607) · CPC title

• H04N9/3188

  Scale or resolution adjustment (scaling in general G06T3/40; resolution modifying circuits for displays in general G09G5/391) · CPC title